Control unit for an electric cash register



FIG. 1 is a top, front and left side perspective view of a control unit for an electric cash register showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; 

The ornamental design for a control unit for an electric cash register, substantially as shown and described. 